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Subtract 12/30 from 21/18

1st number: 1 3/18, 2nd number: 12/30

21/18 - 12/30 is 23/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 30 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 18 × 5 = 90,
    21/18 = 21 × 5/18 × 5 = 105/90
  3. Likewise, for the 2nd fraction, since 30 × 3 = 90,
    12/30 = 12 × 3/30 × 3 = 36/90
  4. Subtract the two like fractions:
    105/90 - 36/90 = 105 - 36/90 = 69/90
  5. After reducing the fraction, the answer is 23/30

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